Siemens SINUMERIK 828D Function Manual page 1720

Z1: NC/PLC interface signals
19.12 Feeds (V1)
DB21, ...
DBB4 Feedrate override
The factors listed in the table for the feedrate override are stored in the machine data:
MD12030 $MN_OVR_FACTOR_FEEDRATE [n].
The table contains the default settings.
The number of possible switch settings for standard machine panels is described in the
Configuration Guides for SINUMERIK 840D.
Corresponding to .... DB21, ... DBX6.7 (feed rateoverride active)
MD12030 $MN_OVR_FACTOR_FEEDRATE [n] (evaluation of the path feed rate override switch)
MD12100 $MN_OVR_FACTOR_LIMIT_BIN (limit for binary coded override switch)
1720
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions